1 #ifndef _ASM_X86_UACCESS_64_H
2 #define _ASM_X86_UACCESS_64_H
5 * User space memory access functions
7 #include <linux/compiler.h>
8 #include <linux/errno.h>
9 #include <linux/lockdep.h>
10 #include <asm/alternative.h>
11 #include <asm/cpufeatures.h>
15 * Copy To/From Userspace
18 /* Handles exceptions in both to and from, but doesn't do access_ok */
19 __must_check unsigned long
20 copy_user_enhanced_fast_string(void *to, const void *from, unsigned len);
21 __must_check unsigned long
22 copy_user_generic_string(void *to, const void *from, unsigned len);
23 __must_check unsigned long
24 copy_user_generic_unrolled(void *to, const void *from, unsigned len);
26 static __always_inline __must_check unsigned long
27 copy_user_generic(void *to, const void *from, unsigned len)
32 * If CPU has ERMS feature, use copy_user_enhanced_fast_string.
33 * Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
34 * Otherwise, use copy_user_generic_unrolled.
36 alternative_call_2(copy_user_generic_unrolled,
37 copy_user_generic_string,
39 copy_user_enhanced_fast_string,
41 ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
43 "1" (to), "2" (from), "3" (len)
44 : "memory", "rcx", "r8", "r9", "r10", "r11");
48 __must_check unsigned long
49 copy_in_user(void __user *to, const void __user *from, unsigned len);
51 static __always_inline __must_check
52 int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size)
56 if (!__builtin_constant_p(size))
57 return copy_user_generic(dst, (__force void *)src, size);
61 __get_user_asm(*(u8 *)dst, (u8 __user *)src,
62 ret, "b", "b", "=q", 1);
67 __get_user_asm(*(u16 *)dst, (u16 __user *)src,
68 ret, "w", "w", "=r", 2);
73 __get_user_asm(*(u32 *)dst, (u32 __user *)src,
74 ret, "l", "k", "=r", 4);
79 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
80 ret, "q", "", "=r", 8);
85 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
86 ret, "q", "", "=r", 10);
88 __get_user_asm(*(u16 *)(8 + (char *)dst),
89 (u16 __user *)(8 + (char __user *)src),
90 ret, "w", "w", "=r", 2);
95 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
96 ret, "q", "", "=r", 16);
98 __get_user_asm(*(u64 *)(8 + (char *)dst),
99 (u64 __user *)(8 + (char __user *)src),
100 ret, "q", "", "=r", 8);
104 return copy_user_generic(dst, (__force void *)src, size);
108 static __always_inline __must_check
109 int __copy_from_user(void *dst, const void __user *src, unsigned size)
112 return __copy_from_user_nocheck(dst, src, size);
115 static __always_inline __must_check
116 int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size)
120 if (!__builtin_constant_p(size))
121 return copy_user_generic((__force void *)dst, src, size);
125 __put_user_asm(*(u8 *)src, (u8 __user *)dst,
126 ret, "b", "b", "iq", 1);
131 __put_user_asm(*(u16 *)src, (u16 __user *)dst,
132 ret, "w", "w", "ir", 2);
137 __put_user_asm(*(u32 *)src, (u32 __user *)dst,
138 ret, "l", "k", "ir", 4);
143 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
144 ret, "q", "", "er", 8);
149 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
150 ret, "q", "", "er", 10);
153 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
154 ret, "w", "w", "ir", 2);
160 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
161 ret, "q", "", "er", 16);
164 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
165 ret, "q", "", "er", 8);
170 return copy_user_generic((__force void *)dst, src, size);
174 static __always_inline __must_check
175 int __copy_to_user(void __user *dst, const void *src, unsigned size)
178 return __copy_to_user_nocheck(dst, src, size);
181 static __always_inline __must_check
182 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
187 if (!__builtin_constant_p(size))
188 return copy_user_generic((__force void *)dst,
189 (__force void *)src, size);
194 __get_user_asm(tmp, (u8 __user *)src,
195 ret, "b", "b", "=q", 1);
197 __put_user_asm(tmp, (u8 __user *)dst,
198 ret, "b", "b", "iq", 1);
205 __get_user_asm(tmp, (u16 __user *)src,
206 ret, "w", "w", "=r", 2);
208 __put_user_asm(tmp, (u16 __user *)dst,
209 ret, "w", "w", "ir", 2);
217 __get_user_asm(tmp, (u32 __user *)src,
218 ret, "l", "k", "=r", 4);
220 __put_user_asm(tmp, (u32 __user *)dst,
221 ret, "l", "k", "ir", 4);
228 __get_user_asm(tmp, (u64 __user *)src,
229 ret, "q", "", "=r", 8);
231 __put_user_asm(tmp, (u64 __user *)dst,
232 ret, "q", "", "er", 8);
237 return copy_user_generic((__force void *)dst,
238 (__force void *)src, size);
242 static __must_check __always_inline int
243 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
245 return __copy_from_user_nocheck(dst, src, size);
248 static __must_check __always_inline int
249 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
251 return __copy_to_user_nocheck(dst, src, size);
254 extern long __copy_user_nocache(void *dst, const void __user *src,
255 unsigned size, int zerorest);
258 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
261 return __copy_user_nocache(dst, src, size, 1);
265 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
268 return __copy_user_nocache(dst, src, size, 0);
272 copy_user_handle_tail(char *to, char *from, unsigned len);
274 #endif /* _ASM_X86_UACCESS_64_H */